there be 是指某地有某人或者某物的存在，主要分清there 后面那个be用is 还是用
are，there is 后面接可数名词单数还有
不可数名词，there are 后面接可数名词复数，疑问句是重点，主要就是对划线部分提问，我给你举几个例子
,there is a boy in the classroom. 对句中a 提问的话，
要用how many, how many boys(注意many 后加可数名词复数）are there in the classroom?
如果是对a boy 提问，
那么要用what, what's in the classroom?
复数的话，再来一个例子，
there are five boys in the classroom.
对five 提问：how many boys are there(are there不能丢）in the class room?
对five boys提问：what's in the classromm? 和单数句子一样，要注意，无论主语是单数复数，都用what's.
还有一种情况是不可数名词，再举个例子：
there is some water in the bottle.
对some 提问：用（how much因为水不可数）how much water is there in the bottle?
对some water提问：what's in the bottle?(和前面的一样哦，要注意）
（1. 定义：There be句型表示某处存在某物或某人。
2. 结构：(1) There is +单数可数名词/不可数名词+ 地点状语.
(2) There are +复数名词+地点状语.
there是引导词，在句中不充当任何成分，翻译时也不必译出。句子的主语是某人或某物，
谓语动词be要与主语（某人或某物）的数保持一致。当主语是两个或两个以上的名词时，谓语动词要与跟它最近的那个名词一致。
eg. ① There is a bird in the tree. 树上有一只鸟。
② There is a teacher and many students in our classroom. 我们教室里有一位老师和许多学生。
③ There are two boys and a girl under the tree. 树下有两个男孩，一个女孩。
变脸一：否定句
There be句型的否定式的构成和含有
be动词的其它句型一样，在be后加上not或no即可。注意not和no的不同：not是副词，no为形容词，not a/an/any + n. 相当于no+ n.。例如：
There are some pictures on the wall. →There aren't any pictures on the wall. =There are no pictures on the wall.
There is a bike behind the tree. → There isn't a bike behind the tree. =There is no bike behind the tree.
变脸二：一般疑问句
There be句型的一般疑问句变化是把be动词调整到句首，再在句尾加上问号即可，此为“调整法”。但同时要注意：当肯定句中有some时，要将其改为any（否定变化也一样）。看看下面两句是如何“改头换面”的吧：
There is some water on Mars. → Is there any water on Mars?
There are some fish in the water. →Are there any fish in the water?
变脸三：特殊疑问句
There be句型的特殊疑问句形式有以下三种变化：
① 对主语提问：当主语是人时，用“Who's+
介词短语?”；当主语是物时，用“What's + 介词短语?”。注意：无论原句的主语是单数还是复数，对之提问时一般都用be的单数形式(回答时却要根据实际情况来决定)。如：
There are many things over there. →What's over there?
There is a little girl in the room.→Who is in the room?
② 对地点状语提问：提问地点当然用“Where is / are+主语?”啦！例如：
There is a computer on the desk. → Where is the computer?
There are four children on the playground. →Where are the four children?
③ 对数量提问：一般有两种句型结构：
How many+复数名词+are there+介词短语？
How much+不可数名词+is there+介词短语？）